mirror of
https://github.com/git/git.git
synced 2024-11-28 04:23:30 +08:00
4175e9e3a8
There still are quite a few symbols that ought to be static. Signed-off-by: Junio C Hamano <gitster@pobox.com>
108 lines
2.1 KiB
C
108 lines
2.1 KiB
C
/*
|
|
* csum-file.c
|
|
*
|
|
* Copyright (C) 2005 Linus Torvalds
|
|
*
|
|
* Simple file write infrastructure for writing SHA1-summed
|
|
* files. Useful when you write a file that you want to be
|
|
* able to verify hasn't been messed with afterwards.
|
|
*/
|
|
#include "cache.h"
|
|
#include "csum-file.h"
|
|
|
|
static void sha1flush(struct sha1file *f, unsigned int count)
|
|
{
|
|
void *buf = f->buffer;
|
|
|
|
for (;;) {
|
|
int ret = xwrite(f->fd, buf, count);
|
|
if (ret > 0) {
|
|
buf = (char *) buf + ret;
|
|
count -= ret;
|
|
if (count)
|
|
continue;
|
|
return;
|
|
}
|
|
if (!ret)
|
|
die("sha1 file '%s' write error. Out of diskspace", f->name);
|
|
die("sha1 file '%s' write error (%s)", f->name, strerror(errno));
|
|
}
|
|
}
|
|
|
|
int sha1close(struct sha1file *f, unsigned char *result, int final)
|
|
{
|
|
unsigned offset = f->offset;
|
|
if (offset) {
|
|
SHA1_Update(&f->ctx, f->buffer, offset);
|
|
sha1flush(f, offset);
|
|
f->offset = 0;
|
|
}
|
|
if (!final)
|
|
return 0; /* only want to flush (no checksum write, no close) */
|
|
SHA1_Final(f->buffer, &f->ctx);
|
|
if (result)
|
|
hashcpy(result, f->buffer);
|
|
sha1flush(f, 20);
|
|
if (close(f->fd))
|
|
die("%s: sha1 file error on close (%s)", f->name, strerror(errno));
|
|
free(f);
|
|
return 0;
|
|
}
|
|
|
|
int sha1write(struct sha1file *f, void *buf, unsigned int count)
|
|
{
|
|
if (f->do_crc)
|
|
f->crc32 = crc32(f->crc32, buf, count);
|
|
while (count) {
|
|
unsigned offset = f->offset;
|
|
unsigned left = sizeof(f->buffer) - offset;
|
|
unsigned nr = count > left ? left : count;
|
|
|
|
memcpy(f->buffer + offset, buf, nr);
|
|
count -= nr;
|
|
offset += nr;
|
|
buf = (char *) buf + nr;
|
|
left -= nr;
|
|
if (!left) {
|
|
SHA1_Update(&f->ctx, f->buffer, offset);
|
|
sha1flush(f, offset);
|
|
offset = 0;
|
|
}
|
|
f->offset = offset;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
struct sha1file *sha1fd(int fd, const char *name)
|
|
{
|
|
struct sha1file *f;
|
|
unsigned len;
|
|
|
|
f = xmalloc(sizeof(*f));
|
|
|
|
len = strlen(name);
|
|
if (len >= PATH_MAX)
|
|
die("you wascally wabbit, you");
|
|
f->namelen = len;
|
|
memcpy(f->name, name, len+1);
|
|
|
|
f->fd = fd;
|
|
f->error = 0;
|
|
f->offset = 0;
|
|
f->do_crc = 0;
|
|
SHA1_Init(&f->ctx);
|
|
return f;
|
|
}
|
|
|
|
void crc32_begin(struct sha1file *f)
|
|
{
|
|
f->crc32 = crc32(0, Z_NULL, 0);
|
|
f->do_crc = 1;
|
|
}
|
|
|
|
uint32_t crc32_end(struct sha1file *f)
|
|
{
|
|
f->do_crc = 0;
|
|
return f->crc32;
|
|
}
|